package com.ffcs.test.sentinel;

import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author 天真热
 * @create 2024-01-26 22:10
 * 建立统一的异常处理服务
 * 如果需要呗降级的方法没有配置@SentinelResource，则默认走这里
 * @desc
 **/
@Component
public class MyBlockExceptionHandler implements BlockExceptionHandler {
    public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception {
        String msg = "";
        if (e instanceof FlowException) {
            msg = "接口限流了";
        } else if (e instanceof DegradeException) {
            msg = "服务降级了";
        } else if (e instanceof ParamFlowException) {
            msg = "热点参数限流了";
        } else if (e instanceof SystemBlockException) {
            msg = "触发系统保护规则了";
        } else if (e instanceof AuthorityException) {
            msg = "授权规则不通过";
        }
        //返回json数据
        new ObjectMapper().writeValue(response.getWriter(), msg);
    }
}
